Spinning this off from bug 1388931 comment 35 to land a minimal subset of the r+'ed patches there in order to remove the WebIDL methods for creating and mutating SVG path data. We can finish off the rest of that bug later.

Not the same shim, an updated one because parts of the old API remain, unlike in Chrome.
https://github.com/progers/pathseg
This is why breaking changes would be appreciated in the release notes and more than three weeks before release.

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